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Securities - Amortized Cost and Fair Value of Securities Available for Sale and Held to Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost within one year | $ 44,206 | $ 37,386
Amortized cost one to five years | 61,594 | 41,230
Amortized cost for five to ten years | 136,857 | 117,004
Amortized cost for after ten years | 589,200 | 213,574
Available for sale | 831,857 | 409,194
Amortized Cost | 1,090,363 | 822,089
Within one year, amortized cost | 7,302 | 7,811
One to five years, amortized cost | 42,742 | 56,037
Five to ten years, amortized cost | 82,087 | 94,756
After ten years, amortized cost | 25,290 | 32,163
Total amortized cost | 157,421 | 190,767
Investment securities, held to maturity | 168,676 | 207,899
Fair value within one year | 44,192 | 37,321
Fair value for one to five years | 63,006 | 41,293
Fair value for five to ten years | 145,102 | 122,145
Fair value for after ten years | 615,473 | 218,193
Total fair value | 867,773 | 418,952
Investment securities, available for sale | 1,134,025 | 834,776
Within one year, fair value | 7,327 | 7,874
One to five years, fair value | 44,358 | 57,048
five to ten years, fair value | 88,300 | 98,480
After ten years, fair value | 28,471 | 34,440
Total fair value | 168,456 | 197,842
Fair Value | 179,990 | 215,147
Federal agency collateralized mortgage obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale | 144,022 | 267,272
Amortized Cost | 144,022 | 267,272
Investment securities, held to maturity | 2,661 | 4,560
Investment securities, available for sale | 147,453 | 269,252
Fair Value | 2,697 | 4,568
Federal agency mortgage–backed pools |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale | 114,484 | 145,623
Amortized Cost | 114,484 | 145,623
Investment securities, held to maturity | 8,594 | 12,572
Investment securities, available for sale | 118,799 | 146,572
Fair Value | $ 8,837 | $ 12,737

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